This 3.5-Ohm aramature is a stock replacement for Tyco / Mattel 440 / 440-X2 chassis. If you want to build a missile, then these are for you. Combine them with the Viper level 4 motor magnets and level 10 traction magnets and you'll blow the competition away.

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This 2.8-Ohm aramture is designed to be a stock replacement for SG+, Viper, BSRT, and similar chassis. Want some insane speed, then this arma...